HEX to OKLCH: #1E40AF

Also known as: Tailwind v3 blue-800

#1E40AF → oklch(0.424 0.181 265.6)

Values are shown at full precision, so converting back gives exactly #1e40af. The rounded form is what you normally paste into CSS.

Step-by-step math

Every number below is computed from the input, nothing is looked up.

1. sRGB → linear

R: 30/255 = 0.11765 → 0.012983  (((x + 0.055) / 1.055)^2.4)
G: 64/255 = 0.25098 → 0.051269  (((x + 0.055) / 1.055)^2.4)
B: 175/255 = 0.68627 → 0.428690  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.054904
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.083690
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.285656

3. cube root

l′ = ∛0.054904 = 0.380073
m′ = ∛0.083690 = 0.437413
s′ = ∛0.285656 = 0.658589

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.42445
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = -0.01376
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.18034

5. Oklab → OKLCH

C = √(a² + b²) = 0.18087
H = atan2(b, a) = 265.638°
L = 0.42445

6. OKLCH

oklch(0.42445 0.18087 265.638)
rounded: oklch(0.424 0.181 265.6)

All formats

HEX: #1e40af
RGB: rgb(30 64 175)
RGB (legacy): rgb(30, 64, 175)
HSL: hsl(225.93 70.73% 40.20%) → hsl(226 71% 40%)
HWB: hwb(226 12% 31%)
OKLCH: oklch(0.424 0.181 265.6) · oklch(42.4% 0.181 265.6)
OKLab: oklab(0.424 -0.014 -0.180)
Lab (D50): lab(30.79 22.35 -63.84)
LCH (D50): lch(30.79 67.64 289.29)
Display P3: color(display-p3 0.1508 0.2478 0.6609)
Linear sRGB: color(srgb-linear 0.0130 0.0513 0.4287)

Gamut: sRGB and Display P3

#1E40AF is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.290 and Display P3 reaches 0.290; this color uses 62% of the sRGB chroma available.

CSS snippets

.element {
  color: #1e40af;
  color: rgb(30 64 175);
  color: hsl(226 71% 40%);
  color: oklch(0.424 0.181 265.6);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.424 0.181 265.6);
}
/* arbitrary values */
class="text-[#1e40af] bg-[oklch(0.424_0.181_265.6)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.1508 0.2478 0.6609); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #1e40af calc(l - 0.1) c h); }

Nearby colors

Closest colors in the Tailwind and CSS named palettes (OKLab distance).

Lighter and darker, same hue and chroma

#2D53C3 · oklch(0.484 0.181 265.6) · ΔL +0.06
#112C9B · oklch(0.364 0.181 265.6) · ΔL −0.06

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